2008 JEEP GRAND CHEROKEE heating

Towing Tips Ð Electronic Speed Control (If
Equipped)
þ
Don't use in hilly terrain or with heavy loads.
þWhen using the speed control, if you experience speed
drops greater than 10 mph (16 km/h), disengage until
you can get back to cruising speed.
þUse speed control in flat terrain and with light loads to
maximize fuel efficiency.
Towing Tips Ð Cooling System
To reduce potential for engine and transmission over-
heating, take the following actions:
þCity Driving
When stopped for short periods of time, put transmission
in neutral and increase engine idle speed.
þHighway Driving
Reduce speed.
þAir Conditioning
Turn off temporarily.
þrefer to Cooling System Operating information in the
Maintenance section of this manual for more informa-
tion.
RECREATIONAL TOWING (BEHIND
MOTORHOME, ETC.)
Recreational towing is not allowed.
296 STARTING AND OPERATING

IF YOUR ENGINE OVERHEATS
In any of the following situations, you can reduce the
potential for overheating by taking the appropriate ac-
tion.
²On the highways Ð Slow down.
²In city traffic Ð While stopped, put transmission in N
(Neutral), but do not increase engine idle speed.
NOTE:There are steps that you can take to slow down
an impending overheat condition. If your air conditioner
is on, turn it off. The air conditioning system adds heat to
the engine cooling system and turning off the A/C
removes this heat. You can also turn the Temperature
Control to maximum heat, the Mode Control to floor, and
the Fan Control to High. This allows the heater core to act
as a supplement to the radiator and aids in removing heat
from the engine cooling system.
CAUTION!
Driving with a hot cooling system could damage
your vehicle. If the temperature gauge reads ªHº,
pull over and stop the vehicle. Idle the vehicle with
the air conditioner turned off until the pointer drops
back into the normal range. If the pointer remains on
the ªHº, and you hear continuous chimes, turn the
engine off immediately, and call for service.
WHAT TO DO IN EMERGENCIES 299
6

WARNING!
A hot exhaust system can start a fire if you park over
materials that can burn. Such materials might be
grass or leaves coming into contact with your exhaust
system. Do not park or operate your vehicle in areas
where your exhaust system can contact anything that
can burn.
In unusual situations involving grossly malfunctioning
engine operation, a scorching odor may indicate severe
and abnormal catalyst overheating. If this occurs, the
vehicle should be stopped, the engine shut off and the
vehicle allowed to cool. Thereafter, service, including a
tune-up to manufacturer's specifications, should be ob-
tained immediately.To minimize the possibility of catalyst damage:²Do not shut off the engine or interrupt the ignition
when the transmission is in gear and the vehicle is in
motion.
²Do not try to start engine by pushing or towing the
vehicle.
²Do not idle the engine with any spark plug wires
disconnected or removed, such as when diagnostic
testing, or for prolonged periods during very rough
idling or malfunctioning operating conditions.
Maintenance-Free Battery
Your vehicle is equipped with a maintenance-free battery.
You will never have to add water, nor is periodic main-
tenance required.
318 MAINTAINING YOUR VEHICLE

Air Cleaner Filter...................... 316
Break-In Recommendations................ 66
Checking Oil Level..................... 311
Compartment......................... 306
Compartment Identification............... 306
Coolant (Antifreeze).................... 324
Cooling............................. 324
Exhaust Gas Caution..................66,281
Fails to Start.......................... 244
Fuel Requirements..................278,352
Oil .............................. 311,352
Oil Change Interval.................... 312
Oil Selection.......................313,352
Overheating.......................... 299
Starting............................. 242
Temperature Gauge..................... 178
Engine Oil Viscosity...................... 314
Engine Oil Viscosity Chart................. 314
Enhanced Accident Response Feature.......... 52Entry System, Illuminated.................. 19
Ethanol............................... 279
Event Data Recorder...................... 54
Exhaust Gas Caution................66,281,323
Exhaust System......................... 323
Exterior Finish Care...................... 334
Fabric Care............................ 336
Filters
Air Cleaner.......................... 316
Engine Fuel.......................... 317
Engine Oil........................... 315
Engine Oil Disposal.................... 315
Finish Care............................ 334
Flashers.............................. 298
Hazard Warning....................... 298
Turn Signal.....................174,349,350
Flipper Glass, Liftgate..................... 33
Flooded Engine Starting................... 244
390 INDEX

MP3 Player............................ 212
MTBE/ETBE........................... 279
Multi-Function Control Lever............... 119
Navigation Radio........................ 215
Navigation System....................... 215
New Vehicle Break-In Period................ 66
Occupant Restraints....................... 34
Octane Rating, Gasoline (Fuel).............. 278
Odometer..........................179,180
Trip ................................ 179
Oil, Engine............................ 311
Capacity............................ 352
Change Interval....................... 312
Checking............................ 311
Disposal............................ 315
Filter............................... 315
Filter Disposal........................ 315Materials Added to..................... 315
Pressure Warning Light.................. 176
Recommendation...................313,352
Viscosity............................ 352
Onboard Diagnostic System..............307,308
Opener, Garage Door (HomeLinkt) ........... 148
Outside Rearview Mirrors.................. 75
Overhead Console....................... 147
Overheating, Engine...................179,299
Owner's Manual (Operator Manual).......... 380
Paint Care............................. 333
Paint Damage.......................... 333
Panic Alarm............................ 22
Park Sense System, Rear................... 142
Parking Brake.......................... 253
Passing Light........................... 124
Pedals, Adjustable....................... 130
Personal Settings........................ 190
396 INDEX